Ravne Tunnel, Ravne Park | Bosnian Pyramids Part 1
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Description:
In 2006, Sam Osmanagich discovered the Bosnian pyramids and a huge network of prehistoric tunnels near the town of Visoko in Bosnia-Herzegovina.
Analyses have shown that the tunnel system was created about 30,000 years ago, built from very hard concrete that we don't know today. About 5000 years ago, the tunnels were filled in again for unknown reasons.
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Video length: 06:48
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